Drop Down Button (App Designer) return index of repeated elements

I would like to select an option on the drop down button, the problem is that the options are reapeated!

Thus I would like that the drop down button return the option + the index of the option(S) that correspond to the chosen option.

For instance:

if the Appliance_Manufacturer ={'x','x','x','x','x','y,'z'} (Cell Array)

I would like to make the items list look like this:

{'x','y','z'}

than If I choosed the x, I wanna get:

Select_Manufacturer = [1,2,3,4,5]

which are the indexes where x is.

This is my primitive code:

        function ApplianceManufacturerDropDownValueChanged(app, event)
        
            A = app.Appliance_Manufacturer{:};
            B = cellfun(@(v)sort(char(v)),A,'uni',0);
            C = cellfun(@double,unique(B),'uni',0);

            app.ApplianceManufacturerDropDown.Items = {app.Appliance_Manufacturer{:}};
            app.ApplianceManufacturerDropDown.ItemsData = 1:length(app.ApplianceManufacturerDropDown.Items);
            Select_Manufacturer = app.ApplianceManufacturerDropDown.Value;
            
        end

I have tried to play with the unique function but I didn't get any good results.

I would appreciate any help, and thanks in advance!

Answer 1

[Jon]

Here's a skeleton of the logic regarding using unique. You will have to adapt details regarding getting the users selection etc. Here I just illustrate for when the user selects x as you describe in your question

Appliance_Manufacturer ={'x','x','x','x','x','y','z'} 
[item_list,~,ic] = unique(Appliance_Manufacturer)
idx = strmatch('x',item_list) 
Select_Manufacturer = find(ic==idx)